Commodore 128 here, but shortly moved to the IBM clones...so long ago I can't remember the year. My favorite pc of all time was my 486 DX2 66 in a large tower that had a door and wheels...something I'll never forget, especially loading windows for the first time.

Other moment's....using my black/white laptop with my motorola flip-phone with an RS-232 jack to get on the internet for the first time in 1993...command line at 2400 baud. Mobile internet at its finest. Before this, I stuck strictly to local BBS's...

Best,

LC

Norton...I owned that Packard Bell. If I recall it had a 'turbo button'? Can't remember.

For me it started with the ZX81, a Z80 processor based machine by Sinclair. yes, bought from an ad in a Sunday newspaper magazine supplement, delivered by post. That's how it was in the UK in the 80's. But it was very rudimentary, and I quickly upgraded to the BBC Microcomputer by Acorn, bought in a real shop. It was when I first started serious programming in BASIC and machine code in 6502 and 65C02. For all those in the know, BBC BASIC4 was the business. Anyone else know how to PHA, STX, LDA, BNQ etc? The BBC was my first OVERCLOCKED machine, with an updated 65C02 processor and a clock-doubling circuit made by a company called solidisk. Real overclocking! 2x as fast!

Voted Pentium before realizing that you were asking for first "used". Pentium 75 was the first I owned but the first used would be Apple and IBM computer from 1988 (3rd grade computer class). So I guess it was one of the Apple II models and most likely 386 on the PC side.

When my dad went back to college we had some Windows 3.1 PC that I used to play games on. Still remember having to to type 'win' to boot the OS from DOS.

My first computer though was a Toshiba Satellite Pro that my dad purchased from one of his students for like $50. Still to this day one of my favorite gifts.

It had a Pentium 1 cpu, 16mb of ram, and an 800mb HDD. It ran windows 98 SE and I used it to play Starcraft 1 and Wing Commander. I remember I had to uninstall MS Office just to have enough room to install the Brood War expansion.
Eventually the HDD died and I think the thing got tossed, wish I still had it.

For me it started with the ZX81, a Z80 processor based machine by Sinclair. yes, bought from an ad in a Sunday newspaper magazine supplement, delivered by post. That's how it was in the UK in the 80's. But it was very rudimentary, and I quickly upgraded to the BBC Microcomputer by Acorn, bought in a real shop. It was when I first started serious programming in BASIC and machine code in 6502 and 65C02. For all those in the know, BBC BASIC4 was the business. Anyone else know how to PHA, STX, LDA, BNQ etc? The BBC was my first OVERCLOCKED machine, with an updated 65C02 processor and a clock-doubling circuit made by a company called solidisk. Real overclocking! 2x as fast!

All have SSDs with HDDs for extra storage and backup/Dell-M.2 Samsung 850 EVO PCIe

Optical Drive:

Asus/HP dvd1270 and Samsung/HL-DT-ST DVDRWBD CH30N

LCD/CRT Model:

Asus 266H/Viewsonic 1080p/HP ZR24W

Case:

CM-690/CM-690 II adv/Dell 8900 series

Sound Card:

All use on board (Realtek) w/2.1 speakers

Power Supply:

PC P&C 750/PC P&C Silencer 950/CM 700 Extreme

Mouse:

Logitech

Keyboard:

Logitech

Software:

Windows 10 Pro - 64 bit/Windows 10 Pro - 64bit/Windows 10 Pro - 64bit

Well, first computer used was an IBM System/360 about 1973.
First built was an Altair 8800 kit, which used an 8080 processor.
First used for anything at home was a Texas Instruments TI-99/4A with a TMS9900 processor.
First used at work was a Radio Shack TRS-80 model 1 with a Z-80 processor.

However, my father tried to build a computer once, the Z80. He had a big book with lots of diagrams etc. in it.
The second computer I bought myself, and was the Amiga 500 with Kickstart ROM, even had the Commodore screen - press a button on it and everything turned green!

EDIT: Oh, just remembered - we also had before the C64 something that could use a cartridge, with two analog joysticks (open gimball type), that did not re-center themself. It looks almost the same as the HANIMEX SD 070, but the controllers cables were fixed to the unit, and had an orange small button on each one of them. Could also connect a "lightgun" looking thing for the sportsgame cartridge, and the other game was just a car game.
If I recall correctly, the one we had was the SD 090 for the european market. I think I can dig up an old photo, scan it and enlarge / crop only the device.

However, my father tried to build a computer once, the Z80. He had a big book with lots of diagrams etc. in it.
The second computer I bought myself, and was the Amiga 500 with Kickstart ROM, even had the Commodore screen - press a button on it and everything turned green!

EDIT: Oh, just remembered - we also had before the C64 something that could use a cartridge, with two analog joysticks (open gimball type), that did not re-center themself. It looks almost the same as the HANIMEX SD 070, but the controllers cables were fixed to the unit, and had an orange small button on each one of them. Could also connect a "lightgun" looking thing for the sportsgame cartridge, and the other game was just a car game.
If I recall correctly, the one we had was the SD 090 for the european market. I think I can dig up an old photo, scan it and enlarge / crop only the device.